/*
用--对变量进行重命名--给变量名之前加&
引用必须初始化，引用一旦初始化就不可以在改变
*/
#include <iostream>
using namespace std;

int main()
{
    int a = 10;
    int &b = a;
    cout << "a = " << a << endl;
    cout << "b = " << b << endl;
}